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<quiz>
<question type="category">
  <category>
    <text>$course$/QCM de maths/Première spécialité/Le second degré</text>
  </category>
  <info format="html">
    <text><![CDATA[<p>Trinôme du second degré : forme canonique, discriminant, racines,<br/>
factorisation, somme et produit des racines, signe du trinôme,<br/>
parabole (sommet, orientation, lectures graphiques).</p>]]></text>
  </info>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q01 : Calculer un discriminant</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Quel est le discriminant du trinôme $2x^2 - 3x + 1$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Pour $ax^2 + bx + c$ : $\Delta = b^2 - 4ac$. Avec $a = 2$,<br/>
$b = -3$, $c = 1$ : $\Delta = 9 - 8 = 1$.</p>]]></text>
  </generalfeedback>
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  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>$\Delta = 1$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : $\Delta = b^2 - 4ac = (-3)^2 - 4 \times 2<br/>
\times 1 = 9 - 8 = 1$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$\Delta = 17$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signe : $9 + 8 = 17$ correspond à $b^2 + 4ac$. La<br/>
formule est $b^2 - 4ac$, avec un <strong>moins</strong>.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$\Delta = -1$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $4ac - b^2 = -1$ inverse les deux termes. C'est<br/>
$b^2$ qui vient en premier : $b^2 - 4ac = 9 - 8 = 1$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$\Delta = 3$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : tu as sans doute utilisé $b$ au lieu de $b^2$.<br/>
Ici $b = -3$ donc $b^2 = 9$, et $\Delta = 9 - 8 = 1$.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q02 : Calculer les racines</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Quelles sont les racines du trinôme $2x^2 - 3x + 1$<br/>
(on rappelle que $\Delta = 1$) ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>$\Delta = 1 &gt; 0$ : deux racines<br/>
$x = \dfrac{3 \pm 1}{2 \times 2}$, soit $x_1 = \dfrac{1}{2}$ et<br/>
$x_2 = 1$. Vérification : $2 \times 1 - 3 + 1 = 0$.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
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  <single>true</single>
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  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>$x_1 = \dfrac{1}{2}$ et $x_2 = 1$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : $x = \dfrac{-b \pm \sqrt{\Delta}}{2a}<br/>
= \dfrac{3 \pm 1}{4}$, soit $\dfrac{2}{4} = \dfrac{1}{2}$<br/>
et $\dfrac{4}{4} = 1$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$x_1 = -\dfrac{1}{2}$ et $x_2 = -1$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signe : $-b = -(-3) = +3$. Le numérateur est<br/>
$3 \pm 1$, pas $-3 \pm 1$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$x_1 = 1$ et $x_2 = 2$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de dénominateur : tu as divisé par $2$ au lieu de<br/>
$2a = 4$. La formule est $\dfrac{-b \pm \sqrt{\Delta}}{2a}$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Le trinôme n'a pas de racine réelle</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $\Delta = 1 &gt; 0$, donc il y a exactement deux<br/>
racines réelles distinctes.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q03 : Sommet et forme canonique</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Soit $f(x) = (x - 2)^2 + 3$. Quelles sont les coordonnées du<br/>
sommet de la parabole représentant $f$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Forme canonique $f(x) = a(x - \alpha)^2 + \beta$ : le sommet de<br/>
la parabole est $S(\alpha\,;\,\beta)$. Ici $\alpha = 2$ et<br/>
$\beta = 3$.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
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  <answer fraction="100" format="html">
    <text><![CDATA[<p>$(2\,;\,3)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : sous la forme canonique<br/>
$a(x - \alpha)^2 + \beta$, le sommet est $(\alpha\,;\,\beta)$,<br/>
ici $(2\,;\,3)$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$(-2\,;\,3)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signe classique : dans $(x - \alpha)^2$, on lit<br/>
$\alpha = 2$ car $x - 2 = x - \alpha$. Le signe <strong>moins</strong><br/>
fait que l'abscisse du sommet est $+2$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$(2\,;\,-3)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $\beta = +3$ se lit directement, sans changement de<br/>
signe. Seul $\alpha$ est affecté par le moins de la formule.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$(3\,;\,2)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur d'inversion : $\alpha = 2$ est l'<strong>abscisse</strong> et<br/>
$\beta = 3$ l'<strong>ordonnée</strong> du sommet, pas l'inverse.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q04 : Signe d'un trinôme</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Le trinôme $x^2 - 4x + 3$ a pour racines $1$ et $3$.<br/>
Sur quel ensemble est-il strictement négatif ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Règle du signe d'un trinôme avec deux racines : signe de $a$ à<br/>
l'extérieur des racines, signe opposé entre elles. Ici $a = 1 &gt; 0$<br/>
donc $x^2 - 4x + 3 &lt; 0$ exactement sur $]1\,;\,3[$.</p>]]></text>
  </generalfeedback>
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  <answer fraction="100" format="html">
    <text><![CDATA[<p>Sur $]1\,;\,3[$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : $a = 1 &gt; 0$, donc le trinôme est du signe de<br/>
$a$ (positif) à l'extérieur des racines et du signe contraire<br/>
(négatif) <strong>entre</strong> les racines.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Sur $]-\infty\,;\,1[ \cup ]3\,;\,+\infty[$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : c'est là que le trinôme est <strong>positif</strong> (signe de<br/>
$a$ à l'extérieur des racines, avec $a = 1 &gt; 0$).</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Sur $[1\,;\,3]$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Presque : entre les racines le trinôme est bien négatif,<br/>
mais <strong>en</strong> $1$ et $3$ il s'annule. « Strictement négatif »<br/>
exclut les racines : intervalle ouvert.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Nulle part, car $a &gt; 0$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $a &gt; 0$ garantit un signe positif seulement si<br/>
$\Delta &lt; 0$. Ici il y a deux racines, donc le trinôme change<br/>
de signe.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q05 : Somme et produit des racines</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Le trinôme $x^2 - 5x + 6$ admet deux racines. Que valent leur<br/>
somme $S$ et leur produit $P$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Pour $ax^2 + bx + c$ de racines $x_1$ et $x_2$ :<br/>
$S = x_1 + x_2 = -\dfrac{b}{a}$ et $P = x_1 x_2 = \dfrac{c}{a}$.<br/>
Ici $S = 5$, $P = 6$ (racines $2$ et $3$).</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
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  <single>true</single>
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  <answer fraction="100" format="html">
    <text><![CDATA[<p>$S = 5$ et $P = 6$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : $S = -\dfrac{b}{a} = 5$ et<br/>
$P = \dfrac{c}{a} = 6$. Les racines sont d'ailleurs $2$ et<br/>
$3$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$S = -5$ et $P = 6$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signe : $S = -\dfrac{b}{a}$ avec $b = -5$ donne<br/>
$S = +5$. Le moins de la formule et celui de $b$ se<br/>
compensent.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$S = 6$ et $P = 5$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur d'inversion : la somme se lit sur $b$<br/>
($S = -b/a$) et le produit sur $c$ ($P = c/a$).</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$S = 5$ et $P = -6$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signe sur le produit : $P = \dfrac{c}{a} =<br/>
\dfrac{6}{1} = 6$, sans changement de signe.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q06 : Orientation de la parabole</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Soit $f(x) = ax^2 + bx + c$ avec $a &lt; 0$. Que peut-on dire de la<br/>
parabole représentant $f$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Le signe de $a$ donne l'orientation : $a &gt; 0$ branches vers le<br/>
haut (sommet minimum), $a &lt; 0$ branches vers le bas (sommet<br/>
maximum).</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
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  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>Elle est tournée vers le bas et son sommet est un maximum</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : quand $a &lt; 0$, les branches descendent et le<br/>
sommet est le point le plus haut de la courbe.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Elle est tournée vers le haut et son sommet est un minimum</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : c'est la situation $a &gt; 0$. Le signe de $a$ commande<br/>
l'orientation des branches.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Elle est tournée vers le bas et son sommet est un minimum</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Incohérent : si les branches descendent, le sommet est<br/>
au-dessus de tout le reste, c'est un <strong>maximum</strong>.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Son orientation dépend du signe de $c$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $c = f(0)$ ne fixe que le point d'intersection avec<br/>
l'axe des ordonnées. L'orientation dépend uniquement du signe<br/>
de $a$.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q07 : Lire les racines sur la parabole</text>
  </name>
  <questiontext format="html">
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" alt="Repère orthonormé avec une parabole tournée vers le bas, de
sommet (1 ; 4), coupant l&#x27;axe des abscisses en x = -1 et x = 3,
et l&#x27;axe des ordonnées en y = 3. C&#x27;est la courbe de
f(x) = -x² + 2x + 3." style="max-width:100%"/></p>
<p>La parabole $\mathcal{P}$ ci-dessous représente un trinôme du<br/>
second degré $f$. Quelles sont les racines de $f$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Les racines d'un trinôme sont les abscisses des intersections de<br/>
sa parabole avec l'axe des abscisses : ici $x = -1$ et $x = 3$.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
  <shuffleanswers>true</shuffleanswers>
  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>$-1$ et $3$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : les racines sont les abscisses des points où<br/>
la parabole coupe l'axe des abscisses, ici $-1$ et $3$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$1$ et $3$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de lecture : $1$ est l'abscisse du <strong>sommet</strong>, pas un<br/>
point de traversée de l'axe des abscisses. La courbe coupe<br/>
l'axe en $x = -1$, à gauche de l'origine.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$1$ et $4$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $(1\,;\,4)$ sont les coordonnées du sommet. Les<br/>
racines se lisent sur l'axe des <strong>abscisses</strong>, là où $f$<br/>
s'annule.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$3$ seulement</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Oubli : la parabole traverse l'axe des abscisses en deux<br/>
points. N'oublie pas l'intersection du côté négatif,<br/>
en $x = -1$.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q08 : Signe de $a$ et de $\Delta$ d'après la courbe</text>
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" alt="Repère orthonormé avec une parabole tournée vers le bas, de
sommet (1 ; 4), coupant l&#x27;axe des abscisses en x = -1 et x = 3,
et l&#x27;axe des ordonnées en y = 3. C&#x27;est la courbe de
f(x) = -x² + 2x + 3." style="max-width:100%"/></p>
<p>D'après la parabole $\mathcal{P}$ ci-dessous, quels sont les<br/>
signes de $a$ (coefficient dominant) et de $\Delta$<br/>
(discriminant) ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Deux informations graphiques : l'orientation des branches donne le<br/>
signe de $a$ (ici vers le bas, $a &lt; 0$) ; le nombre<br/>
d'intersections avec l'axe des abscisses donne le signe de<br/>
$\Delta$ (ici deux points, $\Delta &gt; 0$).</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
  <shuffleanswers>true</shuffleanswers>
  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>$a &lt; 0$ et $\Delta &gt; 0$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : branches vers le bas donc $a &lt; 0$ ; deux<br/>
intersections avec l'axe des abscisses donc deux racines,<br/>
donc $\Delta &gt; 0$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$a &gt; 0$ et $\Delta &gt; 0$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur sur $a$ : les branches de la parabole descendent,<br/>
donc $a &lt; 0$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$a &lt; 0$ et $\Delta &lt; 0$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur sur $\Delta$ : la courbe <strong>coupe</strong> l'axe des<br/>
abscisses (deux racines réelles), donc $\Delta &gt; 0$.<br/>
$\Delta &lt; 0$ correspondrait à une parabole entièrement d'un<br/>
côté de l'axe.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$a &lt; 0$ et $\Delta = 0$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $\Delta = 0$ signifierait que la parabole <strong>touche</strong><br/>
l'axe des abscisses en un seul point (racine double). Ici<br/>
elle le traverse en deux points distincts.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q09 : Cas $\Delta &lt; 0$</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Soit $f(x) = ax^2 + bx + c$ avec $\Delta &lt; 0$. Que peut-on en<br/>
déduire ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Si $\Delta &lt; 0$, le trinôme n'a pas de racine réelle : sa<br/>
parabole ne coupe jamais l'axe des abscisses, donc il garde un<br/>
signe constant, celui de $a$.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
  <shuffleanswers>true</shuffleanswers>
  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>Le trinôme garde le signe de $a$ pour tout réel $x$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : sans racine réelle, le trinôme ne peut pas<br/>
changer de signe : il reste du signe de $a$ sur tout<br/>
$\mathbb{R}$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Le trinôme est strictement positif pour tout réel $x$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Incomplet : c'est vrai seulement si de plus $a &gt; 0$. Avec<br/>
$a &lt; 0$ et $\Delta &lt; 0$, le trinôme est toujours<br/>
<strong>négatif</strong>.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Le trinôme admet une racine double</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : la racine double correspond à $\Delta = 0$. Avec<br/>
$\Delta &lt; 0$, il n'y a <strong>aucune</strong> racine réelle.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Le trinôme change de signe en $x = -\dfrac{b}{2a}$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $-\dfrac{b}{2a}$ est l'abscisse du sommet, pas un<br/>
point de changement de signe. Sans racine, aucun changement<br/>
de signe n'est possible.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q10 : Factoriser un trinôme</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Quelle est la forme factorisée de $x^2 - x - 6$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>Racines de $x^2 - x - 6$ : $\Delta = 1 + 24 = 25$,<br/>
$x = \dfrac{1 \pm 5}{2}$, soit $3$ et $-2$. D'où la<br/>
factorisation $a(x - x_1)(x - x_2) = (x - 3)(x + 2)$.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
  <shuffleanswers>true</shuffleanswers>
  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>$(x - 3)(x + 2)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : les racines sont $3$ et $-2$ (avec<br/>
$\Delta = 25$), donc<br/>
$x^2 - x - 6 = (x - 3)\left(x - (-2)\right) = (x-3)(x+2)$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$(x + 3)(x - 2)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signes : ce produit se développe en<br/>
$x^2 + x - 6$. Vérifie toujours le terme en $x$ après<br/>
factorisation.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$(x - 6)(x + 1)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : ce produit vaut $x^2 - 5x - 6$. Le produit des<br/>
racines doit valoir $-6$ <strong>et</strong> leur somme $1$ : c'est<br/>
$3$ et $-2$, pas $6$ et $-1$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$(x - 2)(x - 3)$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : ce produit vaut $x^2 - 5x + 6$, dont le terme<br/>
constant est $+6$. Ici il faut un produit de racines égal à<br/>
$-6$, donc deux racines de signes opposés.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q11 : Résoudre une inéquation du second degré</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Quel est l'ensemble des solutions de l'inéquation<br/>
$x^2 - 2x - 8 &lt; 0$ ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>$\Delta = 4 + 32 = 36$, racines $\dfrac{2 \pm 6}{2} = 4$ et<br/>
$-2$. Avec $a &gt; 0$, le trinôme est strictement négatif entre ses<br/>
racines : $S = \,]-2\,;\,4[$.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
  <shuffleanswers>true</shuffleanswers>
  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>$]-2\,;\,4[$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : les racines sont $-2$ et $4$<br/>
($\Delta = 36$), et comme $a = 1 &gt; 0$, le trinôme est<br/>
négatif strictement <strong>entre</strong> ses racines.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$]-\infty\,;\,-2[ \cup ]4\,;\,+\infty[$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de règle : à l'extérieur des racines, le trinôme est<br/>
du signe de $a = 1 &gt; 0$, donc <strong>positif</strong>. La partie négative<br/>
est entre les racines.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$[-2\,;\,4]$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Attention au strict : l'inégalité est $&lt; 0$, or le trinôme<br/>
s'annule en $-2$ et $4$. Ces bornes sont donc exclues :<br/>
intervalle ouvert.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>$]2\,;\,4[$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de calcul des racines : $x = \dfrac{2 \pm 6}{2}$<br/>
donne $4$ et $-2$, pas $2$. Reprends la formule<br/>
$x = \dfrac{-b \pm \sqrt{\Delta}}{2a}$.</p>]]></text>
    </feedback>
  </answer>
</question>

<question type="multichoice">
  <name>
    <text>Le second degré — Q12 : Extremum d'un trinôme</text>
  </name>
  <questiontext format="html">
    <text><![CDATA[<p>Soit $f(x) = 2x^2 - 8x + 1$. Quel est l'extremum de $f$ sur<br/>
$\mathbb{R}$, et en quelle valeur de $x$ est-il atteint ?</p>]]></text>
  </questiontext>
  <generalfeedback format="html">
    <text><![CDATA[<p>L'extremum d'un trinôme est atteint en $x = -\dfrac{b}{2a} = 2$ ;<br/>
$f(2) = -7$. Le signe de $a$ ($2 &gt; 0$) indique que la parabole<br/>
est tournée vers le haut : c'est un minimum.</p>]]></text>
  </generalfeedback>
  <defaultgrade>1.0</defaultgrade>
  <penalty>0.0</penalty>
  <hidden>0</hidden>
  <single>true</single>
  <shuffleanswers>true</shuffleanswers>
  <answernumbering>abc</answernumbering>
  <answer fraction="100" format="html">
    <text><![CDATA[<p>Un minimum égal à $-7$, atteint en $x = 2$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Bonne réponse : $x = -\dfrac{b}{2a} = \dfrac{8}{4} = 2$ et<br/>
$f(2) = 8 - 16 + 1 = -7$. Comme $a = 2 &gt; 0$, c'est un<br/>
minimum.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Un maximum égal à $-7$, atteint en $x = 2$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur d'orientation : $a = 2 &gt; 0$, la parabole est tournée<br/>
vers le haut, son sommet est donc un <strong>minimum</strong>.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Un minimum égal à $1$, atteint en $x = 0$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur : $1 = f(0)$ est l'ordonnée à l'origine, pas<br/>
l'extremum. Le sommet est en $x = -\dfrac{b}{2a} = 2$.</p>]]></text>
    </feedback>
  </answer>
  <answer fraction="0" format="html">
    <text><![CDATA[<p>Un minimum égal à $-7$, atteint en $x = -2$</p>]]></text>
    <feedback format="html">
      <text><![CDATA[<p>Erreur de signe : $-\dfrac{b}{2a} = -\dfrac{-8}{4} = +2$.<br/>
Le moins de la formule et celui de $b = -8$ se compensent.</p>]]></text>
    </feedback>
  </answer>
</question>

</quiz>
